DE3667310D1 - PULP CHLORINE UNDER PRESSURE AND CHLORINE INTRODUCTION IN BLAESCHEN. - Google Patents

PULP CHLORINE UNDER PRESSURE AND CHLORINE INTRODUCTION IN BLAESCHEN.

Info

Publication number
DE3667310D1
DE3667310D1 DE8686890168T DE3667310T DE3667310D1 DE 3667310 D1 DE3667310 D1 DE 3667310D1 DE 8686890168 T DE8686890168 T DE 8686890168T DE 3667310 T DE3667310 T DE 3667310T DE 3667310 D1 DE3667310 D1 DE 3667310D1
Authority
DE
Germany
Prior art keywords
chlorine
pulp
mixer
treatment
chlorine gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE8686890168T
Other languages
German (de)
Inventor
Michael I Sherman
Joseph R Phillips
Gordon Rowlandson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kamyr Inc
Original Assignee
Kamyr Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kamyr Inc filed Critical Kamyr Inc
Application granted granted Critical
Publication of DE3667310D1 publication Critical patent/DE3667310D1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Treating Waste Gases (AREA)
  • Treatment Of Sludge (AREA)
  • External Artificial Organs (AREA)
  • Materials For Medical Uses (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

A method and apparatus are provided for increasing the efficiency of treatment of a paper pulp slurry with chlorine gas, such as in the bleaching or delignification of deciduous wood chemical pulps, coniferous wood chemical pulps, and non-wood fibrous chemical pulps. Chlorine gas is intimately mixed with the pulp in a fluidizing mixer (14), the pulp preferably having a consistency of about 7-12%, and then is passed to a retention vessel (20). The discharge of pulp from the mixer to the retention vessel, and from the retention vessel to other treatment structures, is throttled by valves (30, 31) so as to increase the pressure in both the mixer and the retention vessel to above atmospheric, and preferably in the range of about 15-150 psig (1 to 10 bar above atmospheric pressure). The chlorine gas is added to the mixer through one more discs (53) of porous materials having pore sizes in the range of about 5-175 microns, such as porous ceramic or sintered metal discs. The increased pressure during the chlorine treatment, and the introduction of the chlorine gas in the form of minute bubbles, improve the solubility of the chlorine in the pulp slurry and thereby increase the efficiency of treatment. (Figure 1).
DE8686890168T 1985-06-14 1986-06-06 PULP CHLORINE UNDER PRESSURE AND CHLORINE INTRODUCTION IN BLAESCHEN. Expired - Fee Related DE3667310D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74467885A 1985-06-14 1985-06-14

Publications (1)

Publication Number Publication Date
DE3667310D1 true DE3667310D1 (en) 1990-01-11

Family

ID=24993592

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8686890168T Expired - Fee Related DE3667310D1 (en) 1985-06-14 1986-06-06 PULP CHLORINE UNDER PRESSURE AND CHLORINE INTRODUCTION IN BLAESCHEN.

Country Status (9)

Country Link
EP (1) EP0207062B1 (en)
JP (1) JPS61289192A (en)
AT (1) ATE48452T1 (en)
BR (1) BR8602738A (en)
CA (1) CA1276408C (en)
DE (1) DE3667310D1 (en)
FI (1) FI85728C (en)
NO (1) NO168123C (en)
SE (1) SE466459B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US56833A (en) * 1866-07-31 Improvement in bleaching paper-stock
US1971241A (en) * 1933-04-01 1934-08-21 Pennsylvania Salt Mfg Co Method of chlorination
DE1621684A1 (en) * 1967-10-04 1971-07-08 Bellmer Geb Kg Maschf Machine combination for the line section in pulp processing plants
SE387671B (en) * 1973-04-27 1976-09-13 Mo Och Domsjoe Ab COMPACT WHITE BLEACHING, NON-FLUFFAT LIQUID LIGNOCELLULOSE MATERIAL WITH GASY BLEACHING, PREFERABLY ACID GAS

Also Published As

Publication number Publication date
JPS61289192A (en) 1986-12-19
EP0207062B1 (en) 1989-12-06
ATE48452T1 (en) 1989-12-15
SE466459B (en) 1992-02-17
NO168123B (en) 1991-10-07
CA1276408C (en) 1990-11-20
FI862082A (en) 1986-12-15
SE8602592L (en) 1986-12-15
NO168123C (en) 1992-01-15
SE8602592D0 (en) 1986-06-10
FI862082A0 (en) 1986-05-19
FI85728B (en) 1992-02-14
FI85728C (en) 1992-05-25
BR8602738A (en) 1987-02-10
EP0207062A1 (en) 1986-12-30
NO862116L (en) 1986-12-15

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee